i agree with jon,,ive seen alot of belts get chewed up for guys leaving their sleds outside with no stand under it, lifting the track off the ground, you should put a stand under it, the start your sled and let it idle for a bit, then hit the throttle to get the track to free wheel for a bit, this will help belt life greatly. but out of aligned clutch will do the same, as will bad mounts as SIR SLED_DOG stated, and as erick said the torque stop as well.
1993 xlt sp 580
xtra 10 suspension